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Table 1 SABRE cohort characteristics

From: Differences in smoking associated DNA methylation patterns in South Asians and Europeans

  Europeans South Asians P-valuea
Never smokers
N 65 64  
Age in years, mean (SD) 48.5 (4.6) 48.3 (4.3) 0.74
Former smokers
N 14 10  
Age in years, mean (SD) 47.9 (4.2) 46.6 (4.4) 0.46
Age started smoking in years, mean (SD) 17.9 (3.6) 21.5 (6.5) 0.18
Number of cigarettes smoked/day, mean (SD) 23 (12) 13 (9) 2.5 × 10-2
Pack years, mean (SD) 19.9 (14.0) 10.5 (9.9) 8.1 × 10-2
Time since quitting in years, mean (SD) 12.9 (7.9) 12.1 (8.0) 0.82
Current smokers
N 16 20  
Age in years, mean (SD) 46.9 (3.9) 47.8 (4.3) 0.53
Age started smoking in years, mean (SD) 17.9 (4.8) 22.3 (5.8) 2.2 × 10-2
Number of cigarettes smoked/day, mean (SD) 23 (9) 13 (6) 1.0 × 10-3
Pack years, mean (SD) 34.8 (19.3) 17.8 (9.9) 4.5 × 10-3
  1. at-test for ethnic group differences.